/*
 * Source code of the book of Thinking in Java Component Design
 * ��������Java ������
 * ����: �׵���
 * Email: kshark2008@gmail.com
 * Date: 2008-12
 * Copyright 2008-2010
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package component.db.annotation;

import java.lang.annotation.*;

@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.TYPE, ElementType.FIELD})
public @interface PrimaryKey {
	// value 字符串,格式为"s1,s2,...,sn", 其中每个s为一个成员变量名,不是数据库的字段名(通过@DBField 映射到数据库的字段名).

	// 最常见的情况,一个表就只有一个字段作为主键, 比如"userId".

	// 多个字段组合作为主键, 比如"userId, serviceId".
	String value() default "";
}
